5128517672 has 8 divisors (see below), whose sum is σ = 9615970650. Its totient is φ = 2564258832.

The previous prime is 5128517623. The next prime is 5128517741. The reversal of 5128517672 is 2767158215.

It can be written as a sum of positive squares in only one way, i.e., 3688618756 + 1439898916 = 60734^2 + 37946^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320532347 + ... + 320532362.

Almost surely, 2^5128517672 is an apocalyptic number.

It is an amenable number.

5128517672 is a deficient number, since it is larger than the sum of its proper divisors (4487452978).

5128517672 is a wasteful number, since it uses less digits than its factorization.

5128517672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641064715 (or 641064711 counting only the distinct ones).

The product of its digits is 235200, while the sum is 44.

The square root of 5128517672 is about 71613.6695889828. The cubic root of 5128517672 is about 1724.5029916750.

The spelling of 5128517672 in words is "five billion, one hundred twenty-eight million, five hundred seventeen thousand, six hundred seventy-two".